Pressure

PSSR and the written scheme of examination explained

4 min read · Updated 11 June 2026

For pressure-system users, owners, inspection firms and facilities managers managing written schemes of examination and competent-person reports. It is UK-focused and not legal advice.

The Pressure Systems Safety Regulations 2000 (PSSR) require that pressure systems have a written scheme of examination, and are examined by a competent person in line with that scheme before deterioration could cause danger.

What is a written scheme of examination?

A document that specifies which parts of a pressure system are examined, the nature and frequency of examination, and any measures needed to prepare the system for safe examination. It must be drawn up or certified by a competent person before the system is operated.

Which systems are covered?

Systems containing a relevant fluid above 0.5 bar above atmospheric pressure, such as steam boilers, air receivers, autoclaves, compressors and the associated pipework and protective devices.

Duty holder responsibilities

  • Establish the safe operating limits of the system
  • Maintain the system in good repair
  • Ensure examination in line with the written scheme
  • Act on any report of imminent danger before further use

Managing PSSR on CertFlow

CertFlow stores each written scheme against its system, schedules examinations to the right competent person at the scheme intervals, and keeps every report of examination filed and searchable.

From the field

What inspectors commonly see

  • No current written scheme of examination, or one that misses parts that could fail
  • Safety valves and pressure gauges untested or out of calibration
  • Corrosion or wall thinning on receivers, vessels and pipework
  • Examinations overdue against the written scheme
  • Safe operating limits and operating records not documented

Audit risk

Common mistakes

  • Operating a pressure system before a written scheme has been drawn up or certified.
  • Leaving safety valves, gauges or protective devices outside the scheme.
  • Missing examination dates set by the written scheme.
  • Failing to record safe operating limits and changes to the system.
  • Treating a maintenance service as a substitute for a PSSR examination.

Evidence

Records to keep

  • Written scheme of examination and review history.
  • Reports of examination and next due dates.
  • Safe operating limits and protective-device records.
  • Maintenance, repair and modification evidence.
  • Defect reports and confirmation that danger-related repairs were completed before use.

References

Sources & official guidance

Links to primary UK legislation and official regulator guidance. CertFlow is independent and not affiliated with these bodies.

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